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Cisco Nexus 6000 Series Devices
The Cisco Nexus 6000 Series includes 10- and 40-Gigabit Ethernet density in energy-efficient compact form factor switches. The Cisco Nexus 6000 Series Layer 2 and Layer 3 set allow for multiple scenarios such as direct-attach 10- and 40-Gigabit Ethernet access and high-density Cisco Fabric Extender (FEX) aggregation deployments, leaf and spine architectures, or compact aggregation to build scalable Cisco Unified Fabric in the data centers.
Cisco Nexus 6000 Series products use the same set of Cisco application-specific integrated circuits (ASICs) and a single software image across the products within the family, which offers feature consistency and operational simplicity.
Cisco Nexus 6000 Series switches support robust Layer 2 and Layer 3 functions, industry-leading FEX architecture with Cisco Nexus 2000 and Cisco Nexus B22 Blade FEX, in-service software upgrades (ISSUs), and Cisco FabricPath. Operational efficiency and programmability are enhanced on the Cisco Nexus 6000 Series through advanced analytics, PowerOn Auto Provisioning (POAP), and Python/Tool Command Language (Tcl) scripting.
The Cisco Nexus devices include a family of line-rate, low-latency, lossless 10-Gigabit Ethernet, Cisco Data Center Ethernet, Fibre Channel over Ethernet (FCoE), and native Fibre Channel devices for data center applications.
For information about the Cisco Nexus 6000 Series, see the Cisco Nexus 6000 Series Platform Hardware Installation Guide.
http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus6000/sw/release/notes/7x/Nexus6000_Release_Notes_7x.html?mdfid=286270995Limitations：
After installing a Layer 3 license, the following guidelines and limitations apply to the device:
In Service Software Upgrades (ISSUs) are not supported.
Temporary Layer 3 feature licenses are not supported. (The Layer 3 Base Services Package license has a grace period of 0.)
Management Switch Virtual Interfaces (SVIs) are supported without a Layer 3 Base Services Package license, and ISSU can be performed with Management SVIs configured.
All SVIs (whether management keyword is configured or not) are operationally up when no Layer 3 Base Services Package license is installed. After the Layer 3 Base Services Packages feature license is installed, routed SVIs are brought operationally down and then brought back up again. This reload happens because the routed SVIs behave like management SVIs before a Layer 3 Base Services Packages feature license is installed, and the interface state saved in the hardware needs to be cleared followed by programming of the SVI routes in the Forwarding Information Base (FIB).
If you have not enabled any Layer 3 features or configured any Layer 3 interfaces, you can clear a Layer 3 license without having to reload the device. Then, you can perform a non-disruptive ISSU.
After clearing a Layer 3 license, you must copy the running-configuration to the startup-configuration and reload the device. Then, you can perform a non-disruptive ISSU.
After clearing a Layer 3 license, you must copy the running-configuration to the startup-configuration and reload the device. Then, you can perform a non-disruptive ISSU.
Although HSRP and VRRP do not need to be removed before clearing a Layer 3 license, we recommend that you clear their configurations as well.
Although VRRP and HSRP can be configured without a Layer 3 license, they will not work without a Layer 3 license. If they are configured, non-disruptive ISSU is not supported.
http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus6000/sw/interfaces/7x/b_6k_Interfaces_Config_Guide_Release_7x/b_6k_Interfaces_Config_Guide_Release_7x_chapter_010.html
